The Ants of Africa
Genus Crematogaster - Subgenus Crematogaster
Genus Crematogaster Introduction

Subgenus Crematogaster Lund (1831a: 132)

{Crematogaster (Crematogaster) }Diagnostic Features - Antennae 11-jointed. Frontal carinae well developed. Petiole broadened in front and trapezoidal, sometimes truncated or rounded at the anterior angles, sometimes oval. Postpetiole grooved, or sometimes merely impressed.

Bernard (1952) wrote "We arrive, alas, at the group with the most confused systematics, with 68 described species, most eastern (Africa)". He went on to comment how these are the most evolved Crematogaster in biological terms, some with very complicated carton nests and (?reduced) larvae with elongated exudation organs (notably Crem. rivai, from Erithrea). As with the genus as a whole, there was a need for revision "truly hardly possible today". In addition to the specific findings listed below, he noted the Mt. Nimba, Guinea, collections had yielded indeterminable males.

Santschi (1913a) considered Cremastogaster of the group tricolor-menileki, providing a key; this is at ; tricolor now is regarded as a subspecies of castanea. Substantive species separated were degeeri (from Madagascar), menileki, alulai, impressa, amabilis, foraminiceps, castanea (with 14 subspecies); excisa, neuvillei and vulcania. Other useful keys are that for southern Africa by Arnold (1920a), Menozzi (1930b) for Somalia, and Collingwood (1985) for Saudi Arabia.

I came across several of these small brown to black species which seemed quite variable within themselves; but I attempted to select the most consistent characters in separating them into 'species'.


Key to workers, based mainly on historical sources and original descriptions
Note - dichotomy not used where unnecessarily artificial.

Crematogaster santschii and Crematogaster trautweini now reverted to subgenus Oxygyne.

Queen only described - images on species page
Angola - ancipitula
Nomen nudum no known description Zare - charon
Details inadequate + queen; worker TL 4.5 mm; black with appendages dark brown
South Africa + ? Sierra Leone - cicatriculosa
Crematogaster homeri ? wokrerQueen only known - images on species page.  This worker from Cameroun is possibly of the same species; TL ca 3.4 mm, head wholly smooth and sub-circular
Cameroun - homeri
Crematogaster nigransSeems more likely to be a species of Cr. (Sphaerocrema), i.e. postpetiole entire, without median longitudinal groove WC - nigrans
. North African forms with four segmented antennal clubs
.
0 {Crematogaster oasium}TL 3.3-3.7 mm; antennae exceptionally long, reaching as far back as the petiole, scape surpassing occiput by at least one-third its own length: colour brownish red-yellow, front of head and petiole paler, gaster dark brown Sahara - oasium
-- {Crematogaster rivai}Uniformly castaneous brown; TL 3.5-4.0 mm .
. {Crematogaster rivai} Ethiopia & Somalia - rivai
. . .
1 {Crematogaster schultzei}TL 3.3-3.7 mm; antennae exceptionally long, reaching as far back as the petiole, scape surpassing occiput by at least one-third its own length: colour brownish red-yellow, front of head and petiole paler, gaster dark brown South Africa - schultzei
-- Antennae of usual length 2
2 Maxillary palp with 5 segments; all brown or lighter, red-brown or yellow-brown 3
-- Maxillary palp with three/four segments 8
3 {Crematogaster aegyptiaca alitrunk profile}Propodeum spines limited to triangular teeth; TL 4.5-5.3 mm; pronotum profile distinctly humped; gaster with superficial sculpture and coarse pubescence; colour red-brown, gaster darker, may be overall dark East & north east Africa and wider - aegyptiaca
-- Propodeum spines sharp and elongated 4
-- Propodeum spines sharp and elongated --
4
Alitrunk profile relatively flat without a raised section or keel on the mesonotum; quite finely striated on head and lateral alitrunk 5
-- Alitrunk profile curved or humped anteriorly, with a raised section or keel on the mesonotum; more coarsely sculptured, especially on lateral alitrunk 7
5 Crematogaster inconspicuaTL 3.5-3.6 mm; petiole in dorsal view almost quadratic, not much wider anteriorly than posteriorly (similar to mimosae); head rounded-square, wider than the alitrunk; propodeal spines half as long as interbase distance; colour brown to red-brown; pedicel and gaster more yellow-brown Cameroun - inconspicua
-- Crematogaster censorTL 2.5-3.8 mm or less; petiole trapezoidal, widest in front; propodeum at same level of mesonotum but with a deep metanotal groove; head near matt with fine longitudinal striation (near smooth in type); alitrunk with weak sculpturation West Africa & Congo Basin & ?S Africa - censor
-- Crematogaster junodiTL 3.3 mm; though similar in form to censor and sharing some of the matt appearance due to fine spiculation, this has more extensive sculpturation especially on the front of the head and the clypeus but has a shiny gaster South Africa - junodi
7 {Crematogaster senegalensis type form}TL 3.5-5.5 mm; true senegalensis is brown rather than red and vice-versa; gaster brilliant with fine sparse pubescence; mandibles and lateral propodeum with coarse striations
type form - senegalensis
-- Crematogaster tenuipilisTL 3.5-5.5 mm; dark orange-yellow; gaster dullish; head much more coarsely sculptured but mandibles and lateral propodeum with finer striations
Kenya & Tanzania African form - tenuipilis
-- Crematogaster mimosaeTL 3.5-4.4 mm; segments 3-5 of funiculus wider than long; head (particularly on genae) and alitrunk strongly sculptured; brightly coloured wine-red, with gaster near black East Africa & Saudi Arabia - mimosae
-- Crematogaster turkanensisTL 4.5-6.0 mm; yellow-brown, gaster darker; head only weakly sculptured
Kenya - turkanensis
-- Maxillary palp with three/four segments --
9 {Crematogaster nigronitens}TL 2.8-3.8 mm; head distinctly longer than wide, parallel-sided; eyes small and flat; scapes very short; propodeum with acute denticles; colour black
The head shape, small flat eyes and barely or not grooved postpetiole suggest that this is a Sphaerocrema
.
. {Crematogaster nigronitens} Zimbabwe - nigronitens
-- {Crematogaster monticola}Head near square, sides usually convex 10
10 Petiole other than triangular (parallel-sided or pyriform) - see 11 below 11
-- {Crematogaster (Cr) triangular pedicels}Petiole essentially triangular 12
11 {Crematogaster melanogaster petiole}TL 4.6-5.5 mm; petiole pyriform; posterior border with raised prominence; scape extending well beyond occipitum; colour ferruginous-red, gaster darker brown to black .
. {Crematogaster melanogaster} South Africa - melanogaster
-- {Crematogaster constructor pedicel}TL 3.0-3.5 mm; petiole parallel-sided; scape extending beyond occiput; propodeum rounding from dorsum into declivity, with no more than small denticles; colour piceous .
. {Crematogaster constructor pedicel} South Africa - constructor
-- Petiole essentially triangular --
12 {short description of image}{Crematogaster santcshii pedicel}TL 3.3-3.5 mm; post-petiole distinctly wider than petiole; no pilosity; overall very polished and shiny; colour black, antennal club yellowish-red South Africa & Zare - santschii -reverted to subgenus Oxygyne
-- Post-petiole not wider than petiole 13
13 Propodeum with no more than blunt tubercles or minute sharp denticles 14
-- Propodeum with distinct sharp teeth or spines 18
14 Propodeum with no more than blunt tubercles 15
-- Propodeum with distinct but very short teeth 16
15 {short description of image}TL 3.5-4.2 mm; head smooth and shiny, with sparse fine punctures; propodeum with no more than rounded tubercles; body red-brown, darker posteriorly dubiously recorded from sub-Saharan Africa - inermis
-- {short description of image}Limited details; TL 2.5-3.8 mm; head square; mesonotum marginate; propodeal spines absent or no more than tubercles denticles; dark brown or red-brown, head lighter Madagascar & Mauritius - sewelli
16 {Crematogaster delagoensis}TL 3.4-4.1 mm; head, alitrunk and petiole dull; scapes short, not reaching occiput; propodeum with minute denticles; colour brownish black East & southern Africa - delagoensis
-- Colour brown or lighter 17
17 {short description of image}TL 3.5 mm; head, alitrunk and pedicel brown, gaster yellowish .
. {Crematogaster ochraceiventris} Congo - ochraceiventris
-- {Crematogaster acis}TL 2.8-4.0 mm; petiole with quite rounded sides; in profile promesonotum flat and slight carination of the mesonotum; metanotal groove deeply impressed, mesonotum with a vertical posterior face; propodeal spine one third down the declivity, stout and moderately long; subpetiolar spine short and blunt; lateral mesonotum, propodeum and pedicel spiculate, some specimens with faint striations; pilosity sparse, erect hairs few, most on the head and gaster; colour dark brown/black, shiny. Congo Basin - acis
-- {short description of image}TL 2.8-4.0 mm; overall reddish-yellow; gaster lighter; propodeum with distinct but minute spines Sudan - marnoi
-- {Crematogaster (Cr.) latuka}TL 3.5-3.9 mm; head broader than long; sides convex, occipitum impressed; scapes reaching occiput; alitrunk dorsum flattish, sides marginate; propodeal spines short & conical; petiole broader than long; shining, with feeble striation on head, alitrunk laterally and dorsal pronotum; brown ferruginous South Sudan - latuka
return to list Propodeum with distinct sharp teeth or spines --
18 {short description of image}Pronotum convex and mostly emarginate 19
-- {short description of image}Pronotum distinctly marginate and flat, if not concave tricolor-menileki group of Santschi (1912); Arnold group C - 35
19 {short description of image}At least some funiculus joints wider than long Arnold group A - 20
. {short description of image}All joints of funiculus as long as or longer than wide 25
-- Arnold Group A --
20 With very wide heads, sides highly convex 21
-- With head near square 22
21 {Crematogaster kachelibae}TL 4.0-4.2 mm; bicoloured, gaster black, remainder ferruginous red, quite densely sculptured but shiny .
. {Crematogaster kachelibae}. Kenya - kachelibae
-- {Crematogaster rufigena}TL 3.5-4.0 mm; overall colour dark brown or darker, anterior margins brownish-red; alitrunk dull, closely and longitudinally rugulose .
. {Crematogaster rufigena}. Zimbabwe - rufigena
-- {Crematogaster monticola profile}TL 3.8-4.0 mm; colour ferruginous-red or reddish raw umber, posterior of head, alitrunk dorsum and apex of gaster darker to mahogany; essentially smooth and shiny, sides of alitrunk longitudinally striate; clothed all over with distinctive long, silky white pubescence; montane species .
. {Crematogaster monticola profile} South Africa - monticola
-- Head near square --
22 Propodeal spines long 23
-- Propodeal spines short 24
23 {Crematogaster chopardi}TL 3.6-4.5 mm; overall matt, with quite dense puncturation between very fine striate sculpture; general colour very dark red-brown; no erect hairs but short, dense golden pubescence on gaster Niger - chopardi
-- {Crematogaster affabilis}TL not given; head only slightly wider than long; propodeal spines long and thin, at least 0.25 mm; body unicolorous dark brown to black - possibly not separable from chiarinii - simply described from a large worker
Somalia & Saudi Arabia - affabilis
-- {Crematogaster chopardi}TL 4.0-4.5 mm; spines moderate; overall quite shiny, with very fine sculpture; general colour red-brown, gaster darker East Africa - cincta
-- {Crematogaster chiarinii}TL 3.5-4.0 mm; head wider than long; petiole not much wider than long; alitrunk paler than head or gaster; propodeal spines at least 0.2 mm; colour piceous, with reddish pubescence, alitrunk and mandibles .
. {Crematogaster chiarinii} primarily eastern Africa - chiarinii
-- {Crematogaster staitchi}TL 4.0-4.3 mm; spines moderate; overall moderately shiny, with fine sculpture; general colour dark brown-black
Congo Basin - staitchi
-- Propodeal spines short --
24 {crematogaster capensis}TL 4.0-4.5 mm; sculpturation of head and alitrunk essentially striate to rugose; gaster shiny but finely rugulose; colour dirty reddish-brown .
. {crematogaster capensis} East & southern Africa - capensis
-- Crematogaster opacicepsTL 3.6-4.2 mm; head rectangular scarcely longer than wide; propodeal spines moderately long, straight divergent and oblique; dull only clypeus and legs shiny, most of head and alitrunk reticulate-punctate, gaster nitidulous; colour dark dusty-red, gaster brown South Africa & Zaire - opaciceps
return to list All joints of funiculus as long as or longer than wide --
25 Head very superficially sculptured and fairly shiny, at least on posterior two-thirds 26
-- {short description of image}Head dull and closely sculptured except for median narrow longitudinal streak on vertex Arnold group B (gerstaeckeri group) - 30
26 Small species TL no more than 3.0 mm; propodeal spines set well down declivity; petiole with small but distinct antero-ventral tooth 27
-- Larger species, TL 3.0-5.0 mm 28
27 {Crematogaster gallicola profile}Small species TL no more than 3.0 mm, colour piceous; Acacia gall-inhabiter east and southern Africa - gallicola
-- Crematogaster arthurimuelleriTL 3.8 mm; larger mesonotum and a deeper metanotal groove; propodeum with very small denticles; petiole with long thin anterior subventral tooth; probably dark brown, appendages dark yellowish-red; possibly/probably the major (large) worker of gallicola Mozambique - arthurimuelleri
-- Crematogaster rauanaTL mm; darker and smaller than gallicola
north-east Tanzania - rauana
28 Colour, at least head, yellowish or brown 28A
-- Colour of alitrunk essentially reddish 29
28A {Crematogaster bruneipennis}TL 2-4 mm; colour, at least head, yellowish or brown; lateral margins of mesonotum bevelled; propodeal spines short and sharp; nests under bark? Drawing is omniparens
.
. {Crematogaster bruneipennis} West Africa and (? ssp omniparens) South Africa - brunneipennis
-- Crematogaster scutellarisTL 3.5-4.5 mm; propodeal spine longer; head squarer
North Africa and southern Europe - scutellaris
29 {Crematogaster nigriceps}TL 3.0-3.6 mm; colour ferruginous-red, head piceous, appendages dull ferruginous; pubescence very fine and short; head as wide as long, with convex sides, strongly rounded posterior corners and near straight occiput; funiculus segments 3-6 wider than long; head microscopically reticulate, near smooth, alitrunk with reticulate sculpture; Acacia inhabiter East & southern Africa - nigriceps
-- {Crematogaster acaciae profile}TL 3.0-5.0 mm; head distinctly reddish, gaster darker; head wider than long; petiole not much wider than long; head and alitrunk pale unicolorous red; propodeal spines 0.15 mm or less, reduced to tubercles; weakly sculptured; occiput dull; second funiculus segment shorter than third; Acacia inhabiter .
. {Crematogaster acaciae} Pan-African - acaciae
-- Crematogaster gutenbergiTL 3.8-4.5 mm; gaster black but with narrow yellow borders; rest of body essentially red-brown but posterior of head darker; shiny and smooth; few erect hairs but quite long, abundant white pubescence Namibia - gutenbergi
return to list Arnold group B - gerstaeckeri group with sculptured head --
30 Propodeal spines scarcely more than sharp denticles, relatively short scapes and funiculi 31
-- Propodeal spines at least moderately long; scapes and funiculi longer 32
31 {Crematogaster arnoldi}TL 3.0-3.5 mm; colour dark-brown, anterior of head sometimes paler; head more strongly striate than godfreyi (ssp. of sjostedti) East & southern Africa - arnoldi
-- {Crematogaster desperans}TL 3.2-4.0 mm; mesonotum marginate with subdentate prominence at anterior end; colour reddish-brown, alitrunk and pedicel paler; fairly abundant long, decumbent, pale whitish-yellow pubescence all over, especially on gaster (Arnold comparison with bulawayensis, ssp of gerstaeckeri) .
. {Crematogaster desperans} East & southern Africa - desperans
-- {Crematogaster sjostedti bulawayensis}TL 3.6-5.0 mm; very little pilosity or pubescence; sculpturation overall fine, whole ant with a slight gloss; colour variable piceous brown to black .
. {Crematogaster sjostedti} East & southern Africa - sjostedti and varieties inc. bulawayensis
-- Propodeal spines at least moderately long; scapes and funiculi longer --
32 {Crematogaster aloysiisabaudiae profile}TL 3.0-3.5 mm; colour yellow-brown Somalia - aloysiisabaudiae
-- Colour at least dark brown 33
33 Crematogaster retiferaTL 3.3-3.6 mm; very wide head and long scapes surpassing occiput by 1.5 times own width; head, thorax and sides of petiole densely reticulate-punctate and submatt, on sides of head reticulo-striate post-petiole and gaster feebly shagreened and shiny; no erect hairs except at apices; colour brownish-black, appendages and articulation of pedicel red-brown, base of gaster reddish-brown Zimbabwe - retifera
-- Head square or slightly longer than wide 34
34 Crematogaster ruspoliiTL 2.6-3.7 mm; colour dark-brown to black, scape dark red-brown, appendages reddish; ssp atriscapus with head more strongly puncturate than type; distinct puncturation on lateral alitrunk, also on dorsum and sides of pedicel segments Ethiopia & Zaire - ruspolii
-- {Crematogaster gerstaeckeri}TL 3.2-4.0 mm; colour dark brown to black .
. {Crematogaster gestaeckeri} northern sub-Saharan savanna - gerstaeckeri
-- {Crematogaster peringueyi}TL 3.5-5.2 mm; head about one-seventh longer than wide, sides moderately convex, occiput straight; scape barely reaches occiput, funiculus with segments 2-4 at least as long as wide; propodeal spines thin and acute, usually about half as long as interval between bases; dull, very closely striate longitudinally on head more coarsely on alitrunk, gaster shiny and smooth; pilosity scanty but fairly long and yellowish; moderate, decumbent, pale yellowish pubescence; colour dark brown to black .
. {Crematogaster peringueyi} South Africa - peringueyi
-- {Crematogaster impressiceps}TL 3.5-5.0 mm, dimorphic; head square, wider than the alitrunk; quite strongly sculptured with striations; promesonotum convex not marginated; colour dark brown, appendages lighter, antennal club pale to white Cameroun & Congo Basin - impressiceps
-- {Crematogaster zumpti}TL 3.6 mm; eyes relatively large; alitrunk profile convex almost flat, mesonotum with a slight carina but metanotal groove hardly interrupting the profile; propodeal spines one-third down declivity, long, acute and upward pointing; no or minute subpetiolar spine; pilosity and erect hairs sparse; lateral alitrunk and pedicel spiculate; colour dark brown-black .
. {Crematogaster sp F970} West Africa -  zumpti
return to list Arnold Group C - pronotum distinctly marginate, mesonotum variable; profile flat or slightly convex --
35 Propodeum with short acute denticles 36
-- Propodeum with at least moderately long spines 43
36 {Crematogaster (Cr.) vulcania}TL 3.0-4.0 mm; colour black, gaster may be brownish, shiny, moderately pilous Kenya - vulcania
-- Colour primarily brown or lighter 37
37 Crematogaster coelestisTL 2.3-2.8 mm; cf excisa; colour pitch brown, head and gaster duller; noticeable whitish pubescence on head and gaster; largely smooth, except genae and antennal bases finely striate and alitrunk dorsum finely reticulo-granulate, dorsum of petiole microscopically reticulate; segments 2-6 of funiculus longer than wide; promesonotum laterally bordered, less concave than concava West Africa & Congo Basin - coelestis
-- TL generally > 2.8 mm 38
38 TL < 3.5 mm 39
-- TL > 3.5 mm 40
39 {short description of image}TL 2.7-3.3 mm; near solers, neuvillei and ilgii; pro-mesonotum convex only slightly sculptured; few yellowish erect hairs, sparse pubescence; colour dull reddish-brown, head and gaster darker. This and the following three seem likely to be synonymous with alulai as the senior name Ethiopia - alulai
-- {Crematogaster sp A1}TL 2.8 mm; scape narrow reaching posterior border of head, eyes large, oval and moderately prominent; pronotum smooth and shining, convex, margined anteriorly and laterally, anterior angles and sides rounded; metanotal groove deep and well marked; mesonotum with striae on dorsal surface; lateral mesonotum finely punctate; propodeal spines short, sharp and projecting outwards and slightly downwards, marked angle at junction of dorsum and declivity of propodeum; clothed with fine, short, decumbent hairs; colour smooth and shining yellowish-brown but A1 was light to dark brown within a single colony
.
. {Crematogaster painei} ? sp A1 - West Africa & Congo Basin - painei
-- {Crematogaster incorrecta}TL 3 mm; scapes reaching occiput; head near square with only slight convexity of sides; eyes slightly elongated, about 1/4 length of head, set in middle of sides; alitrunk as impressa, laterally raised from promesonotal suture to anterior margin; metanotal groove deep and lateral borders of propodeum raised, spines about 1/3 as long as interval between bases, slightly curved upwards; a few whitish erect hairs on head and gaster, pale pubescence; alitrunk dorsum finely reticulate (smooth in CAR specimen), faintly striate on propodeum dorsum; clear yellow-brown, apex of gaster darker Gabon & Central African Republic - incorrecta
-- Crematogaster ilgiiTL ca 4.0 mm; pro- and mesonotum margined and flatter; propodeal spines stouter; metanotal groove deeper than alulai. Note appears very similar to excisa
Eastern & Southern Africa - ilgii
40 TL 3.5-4.0 mm 41
-- TL 4.0 mm or more 42
41 {short description of image}TL 3.5-3.8 mm; scape almost reaching occiput; glabrous; head and alitrunk clear red, gaster brownish .
. {Crematogaster excisa} ? sp T - pan-African - excisa
-- {short description of image}TL 3.4-3.5 mm; in profile alitrunk slightly convex, mesonotum with a vertical rear face descending into a slightly impressed metanotal groove, propodeal spines near halfway down declivity, stout, acute and triangular; no subpetiolar spine; lateral alitrunk reticulo-striate, markings faint on the pronotum; pilosity sparse and erect hairs few; colour black, shiny .
. {short description of image} Nigeria & Benin - new species - adedoyini
42 {short description of image}TL 3.9-5.0 mm; colour clear brown, gaster chestnut, glabrous .
. {Crematogaster neuvillei cooperi} East and southern Africa - neuvillei
-- Crematogaster solersTL 4.0 mm; head with almost straight sides; pronotum with well defined marginal line; mesonotum emarginate, with median prominence; propodeum with broad triangular teeth, hardly longer than basal width; longer narrower petiole with anterior ventral tooth; erect hairs absent on alitrunk and petiole; head reddish-brown, rest brownish red-yellow, appendages brown Namibia - solers
return to list Propodeal spines more than 2.5 times the width of their base --
. NOTE - the separation of the so-called subspecies, varieties, stirps, etc. of Cr. impressa is a confused mess with the original authors ignoring quite basic features such as sculpturation and colour .
43 Head almost all smooth and fairly shiny (may be finely striate at least anteriorly) 44
-- Head entirely sculptured 46
44 TL 4.0-4.2 mm; posterior part of petiole parallel sides and sides concave; colour light-brown, head yellowish museisapientiae ssp of castanea
-- Petiole with straight sides, not narrowing suddenly in the middle 45
45 TL 3.3-3.4 mm; scape well short of occiput; propodeum striated, spines short; colour essentially blackCrematogaster impressa West Africa & Congo Basin - impressa
-- {Cr menilekii proserpina}TL 3.7-4.0 mm; propodeum not striated, spines longer; colour essentially brownish Pan-African - menilekii
. Head entirely sculptured .
46 {Crematogaster misella}TL 3.4-3.9 mm; head globose; scapes not reaching occiput; very little pilosity or pubescence; head and alitrunk dull and closely reticulate, petiole and gaster shiny; generally reddish brown, gaster darker .
. {Crematogaster misella}. Zimbabwe - misella
-- Alitrunk densely striated and matt; pronotum sometimes concave 47
47 With abundant erect pilosity (montane species) 48
-- Erect pilosity sparse or absent 49
48 Crematogaster amabilis retiariaTL 4.0-4.5 mm; head densely and finely striate, with fine interspersed puncturation; with abundant relatively long pubescence; colour dark brown, apex of gaster almost black; alpine 2700 m and above East Africa - amabilis
-- {Crematogaster (Cr.) foraminiceps}TL 3.4-4.3 mm; head more irregularly striate, with large hair pits, especially on the occiput; colour brown-yellow; subalpine 1700 m .
. {Crematogaster (Cr.) foraminiceps} Kenya & Zare - foraminiceps
. With little or no erect pilosity .
49 At least bicolored with part of the body distinctively lighter than the rest 50
-- Essentially unicolorous 51
50 {Crematogaster tricolor}With the posterior of the gaster darker than the rest of the head and body, and, the base of the gaster lighter than the other parts eastern Africa - tricolor
-- Crematogaster werneri cacozelanBased on cacozela - TL 4.0-4.5 mm; head square, eyes occupy one-third of face; funiculus segments 3-7 as wide as long; pronotum laterally bordered, but promesonotal suture straight and not curved; propodeal spines about a quarter to a third longer than the dorsum of propodeum; lateral alitrunk reticulo-punctate; mostly shiny; colour yellowish-red, gaster black, appendages also dark Pan-African - werneri
. Essentially unicolorous .
51 Crematogaster orobiaTL 2.6-3.5 mm; head square; scapes just exceeding occiput; alitrunk flat, propodeal spines fine, short and directed upward; head and alitrunk dull, head anteriorly sharply and closely striate, alitrunk and petiole finely reticulo-punctate; black, appendages dark brown South Africa - orobia
-- TL > 3.5 mm 52
52 {short description of image}Head subovate; frontal carinae short, not reaching anterior level of the eyes; scapes short; generally no more than brown or brown-red, with gaster darker brown Pan-African - castanea and its numerous varieties
-- Head in full face view square; scapes reaching or almost reaching the occiput; base colour dark red-brown to black 53
53 {Crematogaster stigmata}TL 3.5-4.0 mm; head square; scapes reach occiput; antennal club 3-segmented but apical two segments slender; pronotum bordered, slightly convex; submatt, most of head, declivity of propodeum and gaster shiny, sides of mesonotum densely punctate; pedicel segments finely reticulate; colour dark red-brown, posterior of head darker, gaster yellow ochre to yellow brown; appendages yellow to orange .
. {Crematogaster stigmata} West Africa - stigmata
-- Crematogaster (Cr.) viduaTL 2.8-4.0 mm; head square; frontal carinae reaching posterior third of eyes; eyes feebly convex filling third quarter of face; scapes just surpassing occiput; funiculus segments 3-5 wider than long; pronotum with distinct but rounded margination, slightly concave (cf andrei - impressa); dorsum of head shiny, anterior finely striated, alitrunk finely and densely striated on the dorsum, partly replaced by fine puncturation which dominates the lateral alitrunk, also on pedicel, gaster shiny but with microscopic reticulation; black, appendages dark red, apex of gaster yellowish West Africa - vidua

{short description of image}

Crematogaster (Crematogaster) species B

return to listAlitrunk profile clearly convex; propodeal spines one-third down declivity, long, acute and upward pointing; no subpetiolar spine.

May be from Nigeria, as in Bolton's key to CRIN species (unpublished, 1969).

Crematogaster (Crematogaster) species F257

return to listFrom Ghana, listed by Strickland (1951a) as the only subgenus member in the CRIG (WACRI) collection but the second most common Crematogaster on cocoa (448 collections cf. 778 of Crematogaster striatula). It nests under flakes if bark, using very little carton.

Contents MYRMICINAE Introduction
2007, 2008, 2010, 2011, 2013, 2015 - Brian Taylor CBiol FSB FRES
11, Grazingfield, Wilford, Nottingham, NG11 7FN, U.K.

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